Gait characterisation and classification in horses.
Authors: Robilliard, Pfau, Wilson
Journal: The Journal of experimental biology
Summary
# Gait Characterisation and Classification in Horses Robilliard, Pfau and Wilson (2007) quantified the foot-fall patterns of eight Icelandic horses across walk, tolt, trot, pace, canter and gallop using accelerometers to measure limb timing at various speeds, then applied linear discriminant analysis to identify the kinematic criteria that distinguish each gait. The researchers established precise measurements for stance times, swing times, duty factors and stride frequencies, demonstrating that walk, tolt, trot and pace are symmetrical gaits with equal timing between left and right limb pairs, whilst canters and gallops show directional asymmetry. Notably, differences in contact times between gaits were too small and inconsistent to suggest that metabolic cost or peak limb forces drive gait transitions, though these factors may influence tolt usage at speed extremes. The analysis revealed that running gaits form a kinematic continuum rather than discrete entities, yet walk occupies a more distinct position within the gait classification system. For practitioners, this work provides objective, stride-by-stride classification criteria based on measurable foot-fall timings, enabling consistent identification of gait abnormalities and transitions—particularly valuable when assessing performance horses or identifying lameness that alters normal kinematic relationships.
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Practical Takeaways
- •Gait classification can be reliably determined by measuring foot-fall timing patterns, enabling objective assessment of horse movement quality independent of speed
- •Understanding that gaits cluster as distinct kinematic patterns helps explain why horses naturally select specific gaits at different speeds rather than using variable transitions
- •Symmetric gaits (walk, tolt, trot, pace) have consistent biomechanical signatures that differ from asymmetric gaits (canters, gallops), which may inform training, lameness diagnosis, and rehabilitation protocols
Key Findings
- •Eight Icelandic horses demonstrated eight distinct gaits (walk, tolt, trot, pace, left/right canter, left/right gallop) with characteristic foot-fall timing patterns measurable by accelerometers
- •Walk, tolt, trot, and pace gaits are symmetrical with equal foot-fall timings between left and right limb pairs, while canters and gallops are asymmetrical
- •Linear discriminant analysis successfully classified gaits based on foot-fall timings on a stride-by-stride basis, suggesting gaits cluster as discrete entities rather than a simple continuum
- •Differences in stance times and duty factors between gaits are unlikely to be primary drivers of gait transitions, suggesting metabolic or force factors may not be the main determinants